[vcpkg] Replace explicit bulk operations with fmap

1 files changed, 24 insertions, 0 deletions

diff --git a/toolsrc/include/vcpkg_Util.h b/toolsrc/include/vcpkg_Util.h
new file mode 100644
index 000000000..4ebb2a802
--- /dev/null
+++ b/toolsrc/include/vcpkg_Util.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#include <vector>
+#include <utility>
+
+namespace vcpkg::Util
+{
+    template<class Cont, class Func>
+    using FmapOut = decltype(std::declval<Func>()(std::declval<Cont>()[0]));
+
+    template<class Cont, class Func, class Out = FmapOut<Cont, Func>>
+    std::vector<Out> fmap(const Cont& xs, Func&& f)
+    {
+        using O = decltype(f(xs[0]));
+
+        std::vector<O> ret;
+        ret.reserve(xs.size());
+
+        for (auto&& x : xs)
+            ret.push_back(f(x));
+
+        return ret;
+    }
+}
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